Montgomery County police say they are looking for witnesses to a brutal attack in which a man was beaten, dragged by a vehicle and critically injured.

The victim and another man had left a party and were walking home along Amherst Avenue, near University Boulevard, in Wheaton when they were attacked by a group of men and women in their twenties about 5 a.m. Saturday, police said.

One man was able to get away and tried to flag down passing motorists, police said. The other man was later found lying in the road near the Wheaton Metro station at Georgia Avenue and Reedie Drive, police said. Tire tracks and bits of the man's shirt were found on Amherst Avenue and nearby Reedie Drive, police said.

Investigators said one of the vehicle's wheels spun over and burned the flesh off the man's stomach and thighs. The man, whose identity was not released, was in critical but stable condition at a hospital, police said. The other man was treated at the scene for bruises on his face.

The motive for the attack is unclear, police said. The men were not robbed, and the attackers did not say anything that indicated why they were attacking the men, police said. Anyone who has more information about the incident is urged to call Crime Solvers at 800-673-2777.